Engineers are at the landslip and say it is going to take several days - at least to clear the landslip and re-open the line. A further assessment will be made tomorrow and Monday - at this point they have not said when the line will be clear.
Routes affected (in both directions):
Waterloo to Portsmouth via Eastleigh - these trains will be diverted and will not call at Botley or Hedge End. Journey times will be extended by at least 30 minutes.
Southampton to Portsmouth - these trains will run on their normal route but may be delayed because of congestion caused by the diverted trains.